Neil Young spent his 71st birthday performing Saturday at the site of the Standing Rock Reservation protests against the construction of the Dakota Access Oil Pipeline.

The singer has been strongly supportive of the protests by the Standing Rock Sioux, who claim the oil pipeline will violate sacred Native American lands and potentially poison water supplies in the area such as the Missouri River.

Protests have been going on since April and have attracted the attention of dozens of Native American tribes as well as celebrities and other protesters.

Young recently released a song, “Indian Givers,” about the pipeline. The song will appear on his new album “Peace Trail,” Rolling Stone reported.

Young posted video of himself on Facebook walking through the Standing Rock crowd while playing his guitar and harmonica. “Those who damage Mother Earth, damage us all, forgive them, they don’t see,” he wrote.

Dave Matthews Band and other performers will play a benefit concert for the protesters Nov. 27 at DAR Constitutional Hall, Rolling Stone reported. All proceeds from the concert will provide resources and legal assistance to those fighting the pipeline.

President Barack Obama has said he might consider rerouting the pipeline, but President-elect Donald Trump has not weighed in on the issue.